EP1067640A1 - Faseroptisches Übertragungssystem mit Raman Verstärkung - Google Patents

Faseroptisches Übertragungssystem mit Raman Verstärkung Download PDF

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Publication number
EP1067640A1
EP1067640A1 EP00401696A EP00401696A EP1067640A1 EP 1067640 A1 EP1067640 A1 EP 1067640A1 EP 00401696 A EP00401696 A EP 00401696A EP 00401696 A EP00401696 A EP 00401696A EP 1067640 A1 EP1067640 A1 EP 1067640A1
Authority
EP
European Patent Office
Prior art keywords
fiber
section
raman
amplification
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00401696A
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English (en)
French (fr)
Other versions
EP1067640B1 (de
Inventor
Eric Brandon
Jean-Pierre Blondel
Patrice Le Roux
Denis Toullier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel CIT SA
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Priority to DK00401696T priority Critical patent/DK1067640T3/da
Publication of EP1067640A1 publication Critical patent/EP1067640A1/de
Application granted granted Critical
Publication of EP1067640B1 publication Critical patent/EP1067640B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/003—Devices including multiple stages, e.g., multi-stage optical amplifiers or dispersion compensators

Definitions

  • the present invention relates to the field of fiber transmissions optical, and in particular transmission systems without repeaters. It applies particularly to fiber optic transmission systems, using multiplexing of wavelength (in English "wavelength division multiplexing" or WDM).
  • One of the known solutions for the transmission of signals in fibers optics consists of having at regular intervals along the transmission system optical amplifiers, and in particular optical fiber amplifiers doped with erbium.
  • Such a solution is for example described in Bergano, Long haul WDM transmission using optimum channel modulation: 32 x 5 Gbit / s 9300 km demonstration, OFC'97 post deadline 16.
  • the transmission distances in such a system are limited by the signal to noise ratio, and in particular by the presence of spontaneous amplification noise (ASE, acronym for "amplification” spontaneous noise ”) generated in the amplifiers.
  • the invention proposes a solution to this problem; this solution is simple and effective. It overcomes the limitation imposed on Raman amplification by Rayleigh broadcast.
  • the invention provides a fiber transmission system optical, comprising line fiber and pumping means for a amplification distributed by stimulated Raman scattering in the line fiber, in which the line fiber has several sections, the nature of the section fiber and the length of the sections being chosen so that the Raman gain is lower in any point in the system with the Rayleigh scattering coefficient.
  • the pumping means send a signal of counter-propagating pump.
  • the pumping means send a co-propagating pump signal.
  • the fiber section adjacent to the pumping means includes a large effective area fiber.
  • the fiber section adjacent to said large effective area section includes offset dispersion fiber.
  • the invention proposes, in order to overcome the limitation induced by diffusion Rayleigh, to use several different fibers in a transmission system; of fact, the limitation comes from the fact that when the Raman gain is greater than the Rayleigh diffusion coefficient of the fiber, oscillations can occur.
  • the invention therefore proposes to adapt as a function of the Raman gain and therefore of the pump power, the nature of the fibers, so that the Raman gain remains as far as possible lower than the Rayleigh diffusion coefficient.
  • Figure 1 shows a schematic representation of a transmission according to the invention
  • the system of figure 1 is a system of fiber optic transmission without repeaters, with effect preamplification Raman; therefore appear on the figure the transmitter TX 1, the receiver RX 3, and on the side from the receiver, a pump 5; this pump is used to inject line fiber into counter-propagating signals, which ensure amplification by Raman scattering stimulated.
  • the line fiber between the transmitter and the receiver is made up of several fiber sections.
  • the section 7 closest to the receiver which is the one in which the signal from the pump 5 has the greatest intensity, is chosen so as to avoid oscillations; it is possible in particular to use for this section a fiber having a large effective area, to decrease the Rayleigh diffusion coefficient, and therefore to avoid oscillations.
  • a large effective area is understood to mean an effective area greater than or equal to 70 ⁇ m 2 .
  • the signal strength of pump 5 is less important, and one can in this way use a fiber having an effective area more low, and a significant Raman gain. Fiber can be used for this purpose.
  • offset dispersion DSF or "Dispersion Shifted Fiber"
  • the line fiber to the transmitter is formed of a third section 9.
  • the signal power of the pump is almost negligible, and there is almost no amplification; so there is also no oscillations in this fiber section.
  • the length and nature of the different sections can be adapted as explained now, depending on the Rayleigh broadcast.
  • a fiber having an area is chosen for the first section effective and / or a chemical composition such that the Raman gain is less than the Rayleigh diffusion coefficient.
  • the Raman gain can for example be calculated according to the approximation described in A. R. Chraplyvy, Optical power limits in multi-channel wavelength division multiplexed systems due to Stimulated Raman Scattering, Electronics Letters, vol. 20 n ° 2 (1984), pp. 58-59.
  • the Rayleigh diffusion coefficient is calculated for a fiber like explained in On the theory of backscattering in single mode optical fiber, Arthur H. Hartog et al., Journal of Lightwave Technology, vol. LT-2, April 1984.
  • the fiber length for the first section in depending on the power of the pump to be injected in the second section.
  • varying the length of the first section adjusts the power of the pump which is injected into the second section.
  • the length of the second section can then be determined as a function of the residual pump power to be injected into the third section.
  • the pump power injected into the third section is substantially zero.
  • the invention has been described with reference to a fiber transmission system optical without repeater; however, it also applies to transmission systems using repeaters, in which an effect distributed amplification is used Raman. In this case, the invention can be implemented in the same way, providing between separate repeaters of line fiber.
  • the invention is described in the case where the transmission system has three sections of fiber; it applies to a number of different sections, in depending on the desired configuration.
  • a DSF fiber which has a high Raman gain coefficient and a small effective area; these characteristics favor Raman amplification online.
  • the section 8 another type of fiber, having also a Raman coefficient, for example a standard fiber of the type marketed by the applicant under the reference G652; the Raman coefficient of such a fiber is higher than that of PSCF fiber (acronym of English "pure silica core fiber ").

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
EP00401696A 1999-07-05 2000-06-15 Faseroptisches Übertragungssystem mit Raman Verstärkung Expired - Lifetime EP1067640B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK00401696T DK1067640T3 (da) 1999-07-05 2000-06-15 Kommunikationssystem med optiske fibre med Raman-forstærkning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9908657A FR2796213B1 (fr) 1999-07-05 1999-07-05 Limitation de l'oscillation provoquee par l'amplification raman grace a l'usage de fibres differentes
FR9908657 1999-07-05

Publications (2)

Publication Number Publication Date
EP1067640A1 true EP1067640A1 (de) 2001-01-10
EP1067640B1 EP1067640B1 (de) 2004-08-11

Family

ID=9547722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00401696A Expired - Lifetime EP1067640B1 (de) 1999-07-05 2000-06-15 Faseroptisches Übertragungssystem mit Raman Verstärkung

Country Status (7)

Country Link
US (1) US6366729B1 (de)
EP (1) EP1067640B1 (de)
JP (1) JP2001051309A (de)
AT (1) ATE273577T1 (de)
DE (1) DE60012831T2 (de)
DK (1) DK1067640T3 (de)
FR (1) FR2796213B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012881B4 (de) * 2000-03-16 2008-09-04 Nokia Siemens Networks Gmbh & Co.Kg Ramanverstärkeranordnung
US6452715B1 (en) * 2000-08-29 2002-09-17 Ciena Corporation Method and apparatus for determining a fiber plant gain transfer function and utilizing same to control distributed gain
US6943935B2 (en) * 2001-03-16 2005-09-13 Corning Incorporated Dispersion-managed cable for raman-assisted transmission
EP1326354A3 (de) * 2001-12-07 2005-07-20 Sumitomo Electric Industries, Ltd. Optische Übertragungsleisting, optisches Kabel und optisches Übertragungssystem
US6687443B2 (en) * 2001-12-07 2004-02-03 Sumitomo Electric Industries, Ltd. Optical fiber transmission line, optical cable, and optical transmission system
JP2003255413A (ja) * 2002-03-06 2003-09-10 Sumitomo Electric Ind Ltd ラマン増幅器及び光伝送システム

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0789432A1 (de) * 1996-02-12 1997-08-13 Lucent Technologies Inc. Vorrichtung mit rauscharmem faseroptischem Ramanverstärker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0789432A1 (de) * 1996-02-12 1997-08-13 Lucent Technologies Inc. Vorrichtung mit rauscharmem faseroptischem Ramanverstärker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HANSEN P B ET AL: "Rayleigh scattering limitations in distributed Raman pre-amplifiers", IEEE PHOTONICS TECHNOLOGY LETTERS, JAN. 1998, IEEE, USA, vol. 10, no. 1, pages 159 - 161, XP002134578, ISSN: 1041-1135 *

Also Published As

Publication number Publication date
US6366729B1 (en) 2002-04-02
ATE273577T1 (de) 2004-08-15
FR2796213B1 (fr) 2001-10-05
JP2001051309A (ja) 2001-02-23
DK1067640T3 (da) 2004-12-06
DE60012831D1 (de) 2004-09-16
EP1067640B1 (de) 2004-08-11
FR2796213A1 (fr) 2001-01-12
DE60012831T2 (de) 2005-08-18

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